Import Uncertainty and Export Dynamics
研究进口清关时间的不确定性如何影响发展中国家制造企业的出口生存率，发现不确定性不改变企业进入或退出出口市场的决策，但会降低新出口商的存活率，且影响随时间增大。
Abstract A supply chain is only as strong as its weakest link. Firms are constantly managing uncertainties, including unexpected delays in the provision of a critical input that can slow down or halt the production process, possibly making the manufacturer miss a delivery deadline. As most exporters are also importers of intermediate goods, supply chain unreliability related to import processing times at the border could impact downstream export dynamics. The role of unpredictability in border-clearance times for imports in manufacturing firms’ entry, exit, and survival in export markets is investigated using the PPML estimator on a rich dataset built on firm-level information for 48 developing countries over 2006–2014. Uncertainty in the time to clear imported inputs impacts neither the entry nor the exit rate, but translates into lower survival rates for new exporters, reducing the number of firms that continue serving the foreign market beyond their first year of entry. This effect grows larger over time, owing to rising reputational costs to input-importing exporters and is mainly driven by South-North trade, possibly reflecting the time-sensitivity of buyers in developed countries. Results also reveal heterogeneous effects across export industries, and the mediating role of sunk costs of entry in foreign markets, which attenuate the negative effect of uncertainty on survival rates as firms delay exiting the export market.